人教版英语 八年级下册 Unit8 SectionA 现在完成时态专项讲解 课件.pptxVIP

Unit8 Have you read Treasure Island yet?Grammar:the Perfect Present Tense现在完成时1、定义：?表示过去发生的动作，对现在造成的影响或留有的结果。（即可延动也可非延动） ?表示从过去某时开始的动作，并一直持续到现在。常与for/since 连用。（可延动）2、谓语结构：have/has +V--过分肯定：sb+have/has+V-过分否定：sb+havent/hasnt+V-过分一疑：Have/Has+sb+V-过分?肯答：Yes,sb have/has. 否答：No,sb havent/hasnt.注：?have/has做助动词，后接动词过去分词，与人称代词搭配可缩写成：ve/s(Ive=I have;theyve=they have)。havent=havenot hasnt=has not，其中have用于非三单人称，has用于第三人称单数。?have/has做行为动词表拥有，不能缩写。?能区别hes= he has/he is shes=she has/she is its=it has/it is例句：1、I have already read Little Women?否定句：I read Little Women yet.一疑句：Little Women yet?肯答： 否答：2、Shes lived here since 2008.否定句：She lived here since 2008.一疑句：lived here since 2008? 肯答： 否答：havent Have you readNo,I havent.Yes,I have.hasntHas sheNo, she hasnt.Yes, she has.辨析下列句子：She has long curly hair.She has been to Beijing twice.拥有一现时has为 ,此句为____________,构成否定句可直接在 后加 ;一疑句将_________提到_______。否定句:she been to beijing twice.疑句: to Beijing twice?助动词has意为, 此句为 构成否定句和一般疑问句要借助于助动词 否定句:She long curly hair.一疑句： long curly hair? 肯答:否答:现完时doesnt/does.hasnothasdoesnt句首hasntDoes sheYes,she does.Has she beenNo, she doesnt.辨析下列句子：Hes seen the movie before.Hes watching TV at home now.Hes=He hasHe is Hes=动词过去分词的构成：规则变化：1、直接在动词词尾+ed（finish--finished --finished)2、以“e”结尾+d(invite--invited--invited)3、以“辅音字母+y”结尾，变 “y”为 “i”+ed (study--studied--studied)4、以重读闭音节结尾，且末尾只有一个辅音字母，先双写该辅音字母，再+ed (shop--shopped--shopped)不规则变化：参见课本最后一页1、am/is/are--was/were-been2、have/has-had--had3、see-saw--seen4、do/does--did--done5、go--went---gone6、give--gave--given7、get--got--gotten8、come-came-come一、AAA型（原形、过去式、过去分词一致）1.花费 cost--cost--cost 2.切割 cut--cut--cut3.放置put--put--put 4.读read--read--read5.让let---let--let 6.伤害hurt--hurt--hurt7.关上 shut--shut--shut 8.击打 hit--hit--hit9.设置set--set--